diff options
Diffstat (limited to 'sysdeps/generic/elf/backtracesyms.c')
| -rw-r--r-- | sysdeps/generic/elf/backtracesyms.c | 71 |
1 files changed, 46 insertions, 25 deletions
diff --git a/sysdeps/generic/elf/backtracesyms.c b/sysdeps/generic/elf/backtracesyms.c index b31be6ac5d..319b207605 100644 --- a/sysdeps/generic/elf/backtracesyms.c +++ b/sysdeps/generic/elf/backtracesyms.c @@ -1,5 +1,5 @@ /* Return list with names for address in backtrace. - Copyright (C) 1998,1999,2000,2001,2003 Free Software Foundation, Inc. + Copyright (C) 1998,1999,2000,2001,2003,2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. @@ -48,15 +48,22 @@ __backtrace_symbols (array, size) /* Fill in the information we can get from `dladdr'. */ for (cnt = 0; cnt < size; ++cnt) { - status[cnt] = _dl_addr (array[cnt], &info[cnt], NULL, NULL); + struct link_map *map; + status[cnt] = _dl_addr (array[cnt], &info[cnt], &map, NULL); if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0') - /* We have some info, compute the length of the string which will be - "<file-name>(<sym-name>) [+offset]. */ - total += (strlen (info[cnt].dli_fname ?: "") - + (info[cnt].dli_sname - ? strlen (info[cnt].dli_sname) + 3 + WORD_WIDTH + 3 - : 1) - + WORD_WIDTH + 5); + { + /* We have some info, compute the length of the string which will be + "<file-name>(<sym-name>+offset) [address]. */ + total += (strlen (info[cnt].dli_fname ?: "") + + strlen (info[cnt].dli_sname ?: "") + + 3 + WORD_WIDTH + 3 + WORD_WIDTH + 5); + + /* The load bias is more useful to the user than the load + address. The use of these addresses is to calculate an + address in the ELF file, so its prelinked bias is not + something we want to subtract out. */ + info[cnt].dli_fbase = (void *) map->l_addr; + } else total += 5 + WORD_WIDTH; } @@ -71,25 +78,39 @@ __backtrace_symbols (array, size) { result[cnt] = last; - if (status[cnt] && info[cnt].dli_fname - && info[cnt].dli_fname[0] != '\0') + if (status[cnt] + && info[cnt].dli_fname != NULL && info[cnt].dli_fname[0] != '\0') { - char buf[20]; + if (info[cnt].dli_sname == NULL) + /* We found no symbol name to use, so describe it as + relative to the file. */ + info[cnt].dli_saddr = info[cnt].dli_fbase; - if (array[cnt] >= (void *) info[cnt].dli_saddr) - sprintf (buf, "+%#lx", - (unsigned long)(array[cnt] - info[cnt].dli_saddr)); + if (info[cnt].dli_sname == NULL && info[cnt].dli_saddr == 0) + last += 1 + sprintf (last, "%s(%s) [%p]", + info[cnt].dli_fname ?: "", + info[cnt].dli_sname ?: "", + array[cnt]); else - sprintf (buf, "-%#lx", - (unsigned long)(info[cnt].dli_saddr - array[cnt])); - - last += 1 + sprintf (last, "%s%s%s%s%s[%p]", - info[cnt].dli_fname ?: "", - info[cnt].dli_sname ? "(" : "", - info[cnt].dli_sname ?: "", - info[cnt].dli_sname ? buf : "", - info[cnt].dli_sname ? ") " : " ", - array[cnt]); + { + char sign; + ptrdiff_t offset; + if (array[cnt] >= (void *) info[cnt].dli_saddr) + { + sign = '+'; + offset = array[cnt] - info[cnt].dli_saddr; + } + else + { + sign = '-'; + offset = info[cnt].dli_saddr - array[cnt]; + } + + last += 1 + sprintf (last, "%s(%s%c%#tx) [%p]", + info[cnt].dli_fname ?: "", + info[cnt].dli_sname ?: "", + sign, offset, array[cnt]); + } } else last += 1 + sprintf (last, "[%p]", array[cnt]); |